单选题 In general, lasers operate by creating an intense amount of light and energy which is then converted into heat and used to control bleeding or destroy diseased tissue.
【正确答案】 C
【答案解析】[解析] 题干：普遍来讲，激光创造强烈的光和能量，这种光和能量之后会转化成热量用于止血或杀死败坏的组织。convert转变，修改；transform改变，改造；decode解码。根据题意，C为正确选项。